DE102010039012A1 - Led lamp - Google Patents

Abstract

The invention relates to an LED lamp with a converter and an arrangement of light-emitting diodes arranged on at least one circuit board connected to the converter. The converter is arranged in a multi-part, latchable housing made of electrically non-conductive material that completely surrounds the converter.

Description

Technical area

The invention is based on an LED lamp. Furthermore, the invention relates to a lamp equipped with such an LED lamp.

State of the art

document GB 2 465 966 A discloses a tubular LED lamp (LED, light emitting diode or device, also referred to as light-emitting diode), which can be used as a replacement for a fluorescent lamp in the fluorescent lamp contacts or frames of the lamp. The LED lamp has a transparent tube in which a linear array of LEDs is housed. Although this design provides good protection against unwanted contact with live parts of the LED array, it brings about a poor thermal coupling of the LEDs to the environment, so that the cooling of the LEDs is impaired. Such degraded thermal coupling can result in increased operating temperature and, consequently, lower LED light output and shortening the life. In general, LED lamps designed to replace conventional fluorescent lamps, also referred to as fluorescent retrofit LED modules, should have a long life and high light output. Live parts of the fluorescent retrofit LED modules should be made isolated as touch protection, but isolation may degrade the thermal coupling of the LEDs to the environment, which also compromises the service life.

Presentation of the invention

The object of the present invention is to provide an LED lamp, which is characterized by good Beruhrschutz and high efficiency.

This object is solved by the features of patent claim 1.

Particularly advantageous embodiments can be found in the dependent claims.

Furthermore, with the invention, an LED lamp is provided which has an LED lamp with such a configuration.

The LED lamp according to the invention can be used as a fluorescent retrofit LED module and is characterized by high efficiency and low thermal stress. Furthermore, it offers good protection against contact with live parts.

The efficiency of the system, in lumens / W, is high and in particular better than that of the fluorescent lamp to be replaced, at the same time ensuring a long service life. There are no special converter, z. As voltage converters with very low output voltages of less than 50 V (SELV, Safe Extra Low Voltage) required, the efficiency is often insufficient.

By the transducer is arranged in a completely surrounding the converter housing made of electrically non-conductive material, a particularly secure arrangement is achieved because touching of live parts of the transducer is safely excluded.

It is advantageous if the housing is formed in two parts and the two housing parts are locked together. As a result, the converter can be easily inserted into the housing and this closed. The locking is not readily solvable, in particular not without special tools, special use of force and / or destruction of the housing, whereby the access to live parts is further complicated.

Conveniently, the housing is designed to receive a projecting from the housing LED board and has a projection which presses a live, connected to the transducer spring contact elastically to the LED board. This allows for easy contacting of the LED board, which at the same time allows good shielding of voltage-carrying parts of the LED board and the driver.

By the housing is formed with an optionally formed in the form of a latching hook latching for latching with a Kühlkorper, a simple mounting of the lamp is made possible and a secure mechanical connection between the housing and Kuhlkorper. This is of particular importance, since usually the LED board is arranged on the Kuhlkorper and is ensured by a secure mechanical connection between the heat sink and housing that not inadvertently live parts of the LED board can be touched.

It is also zweckmaßig if at least two LED boards are provided, which are preferably electrically connected to each other by means of a plug connection. As a result, even larger LED lamps can be easily manufactured for the individual boards in sufficient size or shape are not or only with great effort to produce. A connector provides, for example, compared to angeloteten wire connections, also very good protection against touching voltage-carrying parts.

A particularly advantageous embodiment is an LED lamp which has at least one of the following features:
the converter has a boost converter or buck converter,
the LED lamp is designed as a retrofit module as a substitute for a fluorescent lamp,
it is a fuse for connecting two terminals of the LED lamp together, preferably as a replacement for a starter of a fluorescent lamp, provided,
two connections ( 14 . 15 ) of the LED lamp are connected by a short-circuit cable ( 13 ) connected with each other.

Such a converter is particularly effective. LED lamps which are designed as retrofit modules for replacing a fluorescent lamp, are particularly easy to use, as existing luminaires for fluorescent lamps can be used. Lamps for these lights must meet special safety requirements, so that the invention is particularly advantageous for these lamps used. The fuse is used to avoid dangerous high currents that could damage the LED lamp or endanger the user. Replaces a starter, a particularly simple construction is achieved and in case of damage to the fuse this can be easily replaced.

By the heat sink having a flat portion and optionally a semi-circular cross-section outer portion for effective heat dissipation, the LED board is pressed elastically to the flat portion of the heat sink, a particularly simple attachment of the LED board on the Kühlkorper with a particularly good Warmth transition achieved. The elastic contact pressure also avoids damage to the circuit board, which is also desirable for safety reasons, for example due to the contact between components carrying the laser and an electrically conductive cooling body. The semicircular outer portion allows a shape similar to a conventional fluorescent lamp.

It is advantageous if an insulating film is arranged between the flat section and the LED board. Thus, the LED board and the Kuhlkorper are electrically insulated from each other, which in particular by the security increases, as it is reliably avoided that an electrical voltage applied to the cooling body, which could lead to a danger at a touch by the user.

It is also advantageous if the LED board is elastically pressed onto the flat section by a clip made of electrically non-conductive material. This allows a secure mounting of the LED board by simple means, the safety of the clasp is further improved by the insulating property, since the covered by the clasp areas of the board are thus protected from contact. This is particularly advantageous when the clasp covers large parts of the LED board, in particular almost the entire surface, for example, by only the radiation exit surfaces of the LEDs are released or - when using a transparent clip - which can be covered by the LEDs.

A particularly simple construction is achieved when the LED board is inserted into a groove of the cooling body and the clip is held in a recess of the heat sink. This allows in particular a Berührschutz the edge of the board and a secure hold of the clip and thus a particularly safe construction of the LED lamp. A particularly simple structure with high Beruhrschutz is achieved by the groove of Kuhlkorpers is designed to hold the LED board at the same time as a recess for holding the clasp.

By the electrical and electronic components are arranged on a board so that they have to the edge of the board a distance of more than 6 mm, also an increased security is achieved, since this the required creepage and clearance distances can be ensured.

Expediently, the LEDs are connected in series and connected to each LED a Zener diode in anti-parallel. By series connection, the LED can be operated with a high supply voltage, which increases the efficiency. The Zener diodes prevent failure of an LED, the entire lamp fails, making no exchange is necessary, which represents an increased safety hazard, since the risk of voltage-carrying parts is particularly high.

The object is also achieved by an LED light, with an LED lamp according to the invention and optionally a choke connected in series with the converter and / or a fuse replacing a starter. An LED lamp with an LED lamp according to the invention is particularly safe and economical to operate according to the advantages mentioned for the LED lamp. The positioning of the fuse in the luminaire facilitates its installation and replacement. The positioning of the choke and / or the fuse saves space in the LED lamp, which makes them more, for example Can record light-emitting diodes. Also for safety reasons, this arrangement is advantageous because it allows the current flowing in the lamp can be limited.

Advantageously, a method for detecting the aging of an LED lamp, in particular according to the Erindung, in which the voltage drop across the array of LEDs voltage is measured, and is closed from the measurement result on the aging state of the LED lamp. This avoids unnecessary and safety-related refilled lamp replacement, as well as excessive operation with reduced luminosity, which can also pose a safety hazard in the area to be illuminated.

Expediently, the measured voltage is compared with a reference value and determined from the comparison result, whether the LED lamp has reached its end of life. This is a particularly simple procedure.

According to one aspect of the invention, in particular in the arrangement of an electrically insulating clip on the top of the LED board and the arrangement of an insulating film between LED board and Kuhlkörper a construction is proposed which allows a double and / or amplified isolation against live parts easy and at the same time improves the thermal coupling and thus the cooling of the LED lamp and its LEDs. The construction is easy to carry out, so that almost all expensive wiring and / or wiring can be omitted. The structural design can be configured with a variety of possible transducer topologies and operated, for example, up to an operating voltage on the side of the LED connector of 500 V or more.

Depending on the type of fluorescent lamp to be replaced, the respective type of converter can be selected with a view to achieving the best system performance. For example, for long modules intended to replace a L58W fluorescent lamp, boost converters can be selected, while for example, for short lamps such as L18W modules, a buck converter can be used.

In general, the invention is characterized by a high efficiency of the system and allows a safe separation of live parts to beruhrbaren parts. A very simple cost-saving installation is possible, the invention can be used regardless of the respective converter topology (Buck Converter, Boost Converter, Passive converter, SELV). Exemplary embodiments allow a high thermal heat dissipation, which is better than that of LED modules in glass flasks, at the same time increasing the life of the LED lamp is achieved. Furthermore, there is increased security z. B. compared to LED modules in glass flasks with the risk of glass or tube fracture and subsequent Beruhrbarkeit of spannungsfuhrenden parts.

An LED lamp according to the invention can be used for example as a fluorescent retrofit LED module for security class SKII.

According to another aspect of the invention, a method of detecting the aging of an LED lamp is provided. In this case, the voltage drop across the array of LEDs is measured, and closed from the measurement result on the aging state of the LED lamp. The measured, age-dependent voltage drop is a good indicator of aging and thus for the expected remaining life of the LED lamp or for reaching the end of life. Here, the measured voltage can be compared with a reference value, and be determined from the comparison result, whether the LED lamp has reached its end of life or threatens to reach. The measurement of the voltage drop, the comparison and the evaluation can be done automatically. Alternatively or additionally, the light intensity generated by the LED lamp during normal voltage supply can also be measured and compared with a comparison value. From the voltage drop and / or the decrease of the light intensity below the comparison value, the (early) reaching of the end of life can be recognized.

Brief description of the drawings

In the following, the invention will be explained in more detail with reference to exemplary embodiments. The figures show:

1 a schematic representation of an embodiment of the LED lamp according to the invention,

2 a schematic representation of an exemplary embodiment of an inventive construction of an LED lamp,

3 an exemplary embodiment with several LED boards,

4 a cross section of an exemplary embodiment of an LED lamp according to the invention in the field of lamp sockets,

5 an embodiment of an insertable in exemplary embodiments of the inventive LED lamp board, and

6 an embodiment of an applicable in the inventive LED lamp interconnection.

Preferred embodiment of the invention

In 1 is an exemplary embodiment of an LED lamp according to the invention (light-emitting diode lamp) 1 shown, which are suitable as a replacement for a conventional fluorescent lamp without conversion dimensions and in a actually for receiving a fluorescent lamp, for. As a L36W fluorescent lamp, designed conventional contact arrangement or socket or light is used. The LED lamp 1 Thus, in this embodiment, a retrofit LED lamp, z. As an L36W retrofit LED lamp, is.

Between two power supply connections which can be connected to the public power grid 2 . 16 is a series connection of an optionally also überbruckbaren or removable throttle 3 and the LED lamp 1 connected. The LED lamp 1 has contacts or sockets 4 . 5 . 14 . 15 on, which correspond to the usual arrangement and design of the contacts or sockets of the fluorescent lamp to be replaced. The contact 4 is with the throttle 3 connected while the contact 14 to the mains connection 16 connected. The contacts 4 . 5 are with a converter 6 connected in this embodiment has a boost converter with power factor correction (PFC, Power Factor Correction) and an output voltage of z. B. 400 to 500 V can generate. The converter 6 is mechanically with a z. B. as a cooling body 7 or trained in any other form Trager firmly connected in a detachable manner. The radiator body 7 braces a preferably designed as an LED Trager board 9 mechanically off, on the light emitting diodes (LEDs) 49 are arranged. The board 9 lies on the heat sink 7 on and off by a clamp 46 (please refer 4 ) held. The converter 6 is with the board 9 for power supply of the LEDs 49 electrically contacted. Above the board 9 is a translucent cover 8th arranged as a disk, as a half cylinder or, as in 2 is shown as in cross-section round or semicircular cap (see cover 40 ) may be formed and preferably on both long sides with the Kuhlkorper 7 connected is. At the other, from the converter 6 opposite end of the board 9 and / or the heat sink 7 is a housing 12 arranged, which is a bridge or part of the housing of the LED lamp 1 forms and a short circuit path 13 contains the contacts 14 . 15 shorts.

The contacts 5 . 15 are over a line 10 connected to each other, into which a fuse 11 is inserted. The fuse 11 replaces a respective starter provided with a fluorescent lamp and is designed so that it can be used in the starter socket. Alternatively, the fuse 11 also elsewhere on the board or the LED lamp 1 to be ordered.

The exemplary embodiment gemaß 1 can z. B. 100 to 250, in the specific case 143 light-emitting diodes, which are connected in series. The sample is a power factor correction LED retrofit module replacing a L36W fluorescent lamp with improved efficiency and long life. In the embodiment, no wiring is required, and it suffices a simple driver as a converter 6 , Connection options can be on one side of the board 9 z. B. be provided in the form of a plug-in system. The light-emitting diodes 49 can by means of the board 9 simply to a Kuhlkörper, z. B. to the Kuhlkorper 7 , are tied up so that no hot spots (hot spots) occur.

In 2 is an embodiment of the in 1 shown converter 6 shown. The construction according to 2 is characterized by the fact that the modules are pluggable and / or latching, which ensures the simplest installation and high structural and electrical safety. The converter 6 is according to 2 from a two-piece plastic housing 20 enclosed, consisting of two interlocking housing parts 20a . 20b exists, which are inserted into each other. The existing plastic or other electrically non-conductive material housing parts 20a . 20b Compared to the live parts of air or creepage distances, so that the housing 20 safe to touch. The housing part 20a is with the contacts 4 . 5 firmly connected.

In the case 20 is a converter board 21 arranged over lines 22 with the contacts 4 . 5 is electrically connected. On the converter board 21 are the electrical components required by the transducer, such as a choke 23 or a capacitor formed, for example, as an electrolytic capacitor 24 arranged. The converter board 21 sets the over the contacts or Anschlusse 4 . 5 supplied input voltage to a corresponding output voltage, which may be lower or higher than the input voltage depending on the need and the number of light-emitting diodes to be supplied, and on one of the converter board 21 attached output terminal 25 is delivered.

The housing 20 can have a round or rectangular cross-section or other, for Recording of the converter board 21 and the electrical components have a suitable cross section. The housing part 20b is with a transverse to the converter board 21 extending depression 26 provided a heat sink 7a can accommodate and this gives mechanical stability. The heat sink 7a can with the in 2 schematically illustrated Kuhlkorper 7 be connected directly or thermally conductive, so that an effective Gesamtkuhlung of the converter components and the light-emitting diodes 49 is achieved. The cooling body 7 is below one of the LED board 9 corresponding LED board 35 in the in 1 shown manner. The housing part 20b further points at its towards an LED board 35 pointing out the contacts 4 . 5 opposite end face, a nose-shaped projection 27 on, except one down to the LED board 35 pointing opening 28 is completely closed. The LED board 35 can the in 1 shown LED board 9 be.

The lead 27 serves as a contact bracket, one as a metal spring 29 formed electrically conductive contact tongue (spring contact) on the LED board 35 prints. The metal spring 29 is with the output connector 25 the converter board 21 electrically connected and curved in the manner shown formed so that they pass through the nose-shaped projection 27 runs internally and with a U-shaped bend through the opening 28 emerges downward on the LED board is printed electrically conductive and elastic. By the projection 27 becomes the metal spring 29 with sufficient contact pressure on a conductive section (contact surface) 9a the LED board 35 pressed down, the projection 27 at the same time the electrical insulation of the metal spring 29 ensures against the environment.

The radiator body 7 , or alternatively the LED board 35 , can with the converter board 21 about a guide 30 be mechanically connected, for example by snapping, gluing or by slidably receiving. In an advantageous embodiment, the housing part 20b a preferably made of plastic or other material snapper 31 on, which is designed as a latching nose and in a corresponding recess 32 of the cooling body 7 35 can engage. All you have to do is engage the heat sink 7 , or alternatively the LED board 35 , in the lead 30 passing through a corresponding opening of the housing part 20b be pushed in until the snapper 31 in the Kuhlkorper 7 locks. At the same time, the electrical contacting of the LED board takes place automatically 35 through the metal spring 29 , Because the metal spring 29 only in the area of the opening 28 exit and there on the underside by the LED board 35 as well as on the upper side and on the edge by the projection 27 is completely shielded electrically, is given high Beruhrschutz against electrical voltages.

By means of the snapper 31 can the cap, ie the housing part 20b , in the associated with this Kuhlkorper 7 (please refer 1 . 4 ) or in a corresponding recess 32 the same snap or snaps so that no screws are necessary and a complete electrical insulation is achieved.

When mounting is through the metal spring 29 at the same time automatically for the power supply of the LED board 35 taken care of, so that a soldering of wires can be omitted.

In the in the 1 . 2 shown exemplary embodiment is the housing 20 or the converter 6 over one or more snappers 32 on the radiator body 7 fixed and held. Likewise, the further housing 12 that the versions 14 . 15 carries, 6 via one or more snapper on the radiator body 7 be fixed and held. The heat sink 7 forms the solid connection with which the two housings (housing parts) 20 . 12 that is the transducer 6 and the opposing socket carrier, and thus the entire LED lamp module, fixed and stabilized. The LED board 35 does not protrude into the housing in the described embodiment 12 . 20 into it.

In 3 an exemplary embodiment is shown, which allows a connection of multiple LED boards. If a plurality of LED boards should be accommodated depending on the desired light intensity, it may also be desirable for mechanical or space-technical reasons or to achieve gleichmaßiger brightness distribution to arrange the LEDs on two or more boards. The electrical and mechanical connection of two or more LED boards can be realized by soldering or otherwise, but is preferably in the exemplary embodiment according to 3 implemented in the form of an electrical connector. The LED board 35 has for this purpose a peripheral connector arranged 36 on, in a corresponding electrical socket 37 on an LED board 38 can intervene. The LED boards 35 and 38 can thus be electrically connected to each other in a simple manner by pushing together in the longitudinal direction. The arrangement of socket and plug on the boards 35 . 38 can also be reversed. Likewise, both LED boards can similarly be connected to other boards to provide a composite of three or more boards.

In 4 is a cross section through an exemplary embodiment of an LED lamp shown, the z. B. the embodiment according to the 1 to 3 can have. The LED lamp according to 4 has a substantially circular cross-section and includes an LED board, z. B. the LED board 35 according to the 2 . 3 or the LED board 9 according to 1 , as well as a substantially transparent or translucent colored, in cross-section halbbrundformige cover 40 on, the one in 1 shown cover 8th matches and with on both sides of the cover 40 attached, fixed or preferably elastic, hook-shaped locking lugs 41 in serving as recordings recesses 42 can engage for locking. The recesses 42 are at the Kuhlkorper 7 designed so that a firm mechanical connection between the radiator body 7 and the cover 40 is ensured. The radiator body 7 comprises a cross-sectionally semicircular or halbkreisformigen, good heat conducting, z. B. metallic outer body 44 with which a preferably also good heat-conducting, optionally electrically non-conductive frame section 43 connected is. The frame section 43 is with the outer carcass 44 firmly connected and carries inwardly projecting projections 42a that between them the respective recesses 42 define. The sections 42a . 43 . 44 and optionally 48 can be in one piece, z. B. as a continuous casting, made of aluminum or another metallic or good heat conductive material.

In the recesses 42 engages an electrically non-conductive material, preferably plastic, existing clip 46 one that holds the LED board 35 resiliently downwards prints, leaving the LED board 35 with the interposition of an electrically non-conductive, but thermally highly conductive insulating film 47 on a flat plate-shaped section 48 of the cooling body 7 is pressed flat. This ensures good heat conduction between the LED board 35 and the body section 48 and thus the cooling body 7 , This will turn off the LEDs of the LED board 45 , z. B. LEDs 49 , Heat generated effectively over the Kuhlkorper 7 dissipated outside, so the operating temperature of the LEDs 49 is kept low and thereby high efficiency and long life are guaranteed. The cooling body 7 is preferably free from the environment, so that the heat can be dissipated to the environment. The LED board 35 may for example have a thickness of 0.8 mm, which ensures effective heat dissipation.

The plastic clasp 46 can have, transversely to the plane of the drawing, an elongated configuration, but can also by individual, on the LED board 35 in the longitudinal direction distributed clips may be formed.

The clasp 46 can continue to those places where the LEDs 49 be broken, leaving the LED's through the clasp 46 towards the cover 40 project and an effective light output towards the cover 40 and make sure to go outside. The clasp 46 may also be on their cover 40 side facing reflective, so that an effective light output towards the cover 40 and is ensured by this and also the LED board 35 remains invisible.

The LED board 35 is preferably in the between the plate-shaped Kuhlkorperabschnitt 48 and the underside of the projections 42a formed space held firmly and captive and z. B. before firm connection of the sections 43 . 44 in the space below the tabs 42a be introduced.

Temperature measurements on the LED module showed that the thermal influence of the insulating film 47 is low, allowing effective electrical isolation through the insulating film 47 is achieved without the thermal heat transfer from the LED board 35 to the heat sink 43 . 44 . 48 appreciably affected. The temperature difference was, for example, only 2 ° C in embodiments with and without insulating film 47 ,

The mounting of the LED module can, as out 4 it can be seen, even without the aid of tools, screws or the like. The cover 40 can be snapped into the heat sink. Likewise, the clasp 46 in the recesses 42 after insertion of the LED board 35 below the projections 42a be clipped. This ensures a simple low-cost installation and at the same time ensures a good electrical contact protection, since all live parts are inaccessible.

In 5 is an embodiment of a circuit board design of the board schematically and shortened 35 shown, which offers a double or reinforced insulation. This in 5 Board layout shown offers double or reinforced insulation by air and / or creepage distances of at least 6 mm at a voltage of 500 V. The board 35 includes one at its lower edge (as shown in FIG 5 ) trained section 50 with which the circuit board 35 in a heat sink groove, z. B. the in 4 shown, between the lower projections 42a and the plate-shaped Kuhlkörperabschnitt 48 trained groove is einfuhrbar.

Furthermore, the board indicates 35 a section 51 on, which is wider and higher than 6 mm and is formed without spannungsfuhrende components. The section 51 surrounds, how out 5 it can be seen, the board 35 at its entire circumference, ie also left and right as well as above in 5 shown Bestuckungsplatze for the electrical components and components.

On the board 35 are contact surfaces 52 for the input voltage terminals of 0 V and +500 V, one contact surface 53 for mounting a series resistor R1 of, for example, 100 Ω or another suitable value, several connection or mounting surfaces 54 for mounting the light-emitting diodes (LED1, LED2, ...), several mounting surfaces 55 for the attachment of diodes connected in anti-parallel to the respective light-emitting diode, in particular zener diodes, electrical connecting lines 56 and a connection line 57 for the electrical connection the appropriate 5 right outside shown mounting surfaces 54 . 55 for the LED and Zener diode with the contact surface 52 for the input terminal of z. B. +500 V arranged. The individual mounting locations for the LEDs connected in series and Zener diodes are optional at a distance of z. B. 6 mm or more arranged. The width of the board 35 For example, 20 to 25 mm, z. B. 22.8 mm or any other suitable values. The mounting locations for the electrical and electronic components such as resistors, light-emitting diodes and zener diodes, as well as the contact surfaces for the input terminals are preferably in a width of less than 10 mm, e.g. B. 7.7 mm, arranged and extend over a number of per board to be provided light emitting diodes certain length. By this configuration, let a narrow, elongated board realize that has very good insulation against the environment and coming into contact with the board components.

In 6 is an electrical diagram of the interconnection of in 5 shown board 35 shown. The in 6 shown circuit diagram is provided for an LED module according to the above-described embodiment or a further embodiment of the invention, which is here with z. B. 50 to 250, about 143, LEDs 62 equipped in series with a series resistor 61 are switched. The light-emitting diodes 62 are serial between the input terminals 60a . 60b together with the resistor 61 connected. As in case of failure of a light emitting diode 62 the entire series connection was inoperative, is optional any LED with an anti-parallel Zener diode 63 bridged in case of failure (high-ohmic state) of the associated LED 62 becomes conductive due to the then occurring at the LED voltage drop and thus the inoperable LED 62 bridged. Thus, the other, functioning light emitting diodes continue to be powered and generate light. The functional failure is thus limited exclusively to the inoperable LED 62 , In the embodiment according to 6 correspond to the input terminals 60a . 60b the contact surfaces 52 according to 5 , The resistance 61 is at the placement place 53 of the 5 arranged while the light emitting diodes 62 and zener diodes 63 at the Bestuckungs- or contact places 54 respectively. 55 of the 5 are mounted.

According to one aspect of the invention, there is further provided a method of detecting the aging of an LED lamp, e.g. B. created according to the embodiments described above. Here, the s.der arrangement of light emitting diodes 49 or 62 , z. B. at the input terminals 60a . 60b , falling voltage measured, and from the measurement result on the aging condition of the LED lamp closed. In this case, the measured voltage can be compared with a reference value or threshold value, and be closed or determined from the result of the comparison on the still-to-be expected life, whether the LED lamp has reached its end of life. This can be done automatically with a control device, wherein upon reaching the end of life a corresponding warning signal can be generated.

All the features described above and illustrated in the drawings can be combined in any manner individually or in any combination with each other, whereby each self-standing embodiments of the invention are realized. In the context of the invention is also a corresponding method for mounting an LED lamp, wherein the individual components in the in the 1 to 6 shown mated together or assembled without the need for screws.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• GB 2465966A [0002]

Claims (15)

Led lamp ( 1 ), with a converter ( 6 ) and an array of light emitting diodes ( 8th . 35 . 49 ) on at least one board ( 9 . 35 . 38 ), characterized in that the transducer ( 6 ) in one the converter ( 6 ) completely enclosing housing ( 20 ) is arranged from electrically non-conductive material. LED lamp according to claim 1, characterized in that the housing ( 20 ) is formed in two parts and the two housing parts are locked together. LED lamp according to claim 1 or 2, characterized in that the housing ( 20 ) for receiving one from the housing ( 20 ) above LED board ( 35 ) and has a projection which carries a live, with the transducer ( 6 ) connected spring contact ( 29 ) elastically to the LED board ( 35 ). LED lamp according to claim 3, characterized in that the housing ( 20 ) with an optional in the form of a latching hook ( 32 ) formed catch for locking with a Kuhlkörper ( 7 ) is trained. LED lamp according to one of the preceding claims, characterized in that at least two LED boards ( 35 . 38 ) are provided which preferably electrically by means of a plug connection ( 36 . 37 ) are connectable to each other. LED lamp according to one of the preceding claims, with at least one of the following features: the converter ( 6 ) has a boost converter or buck converter, the LED lamp is designed as a retrofit module as a replacement of a fluorescent lamp, it is a fuse ( 11 ) for connecting two connections ( 5 . 15 ) of the LED lamp together, preferably as a replacement for a starter of a fluorescent lamp, provided two terminals ( 14 . 15 ) of the LED lamp are connected by a short-circuit cable ( 13 ) connected with each other. LED lamp according to one of the preceding claims, characterized by a cooling body ( 43 . 44 . 48 ), which has a flat section ( 48 ) and optionally has a semi-circular cross-section outer portion for effective heat dissipation, wherein the LED board ( 9 . 35 . 38 ) to the flat section ( 48 ) of the cooling body is elastically pressed. LED lamp according to one of the preceding claims, characterized in that by between the flat portion ( 48 ) and the LED board ( 9 . 35 . 38 ) an insulating film ( 47 ) is arranged. LED lamp according to one of the preceding claims, characterized in that the LED board ( 9 . 35 . 38 ) on the flat section ( 48 ) by an existing electrically non-conductive material clip ( 46 ) is pressed elastically. LED lamp according to claim 7, characterized in that the LED board is inserted into a groove of the heat sink and that the clasp ( 46 ) is held in a recess of the heat sink. LED lamp according to one of the preceding claims, characterized in that the electrical and electronic components on a circuit board ( 9 . 35 . 38 ) are arranged so that they have a distance of more than 6 mm to the edge of the board. LED lamp according to one of the preceding claims, characterized in that the light-emitting diodes ( 62 ) are connected in series and to each LED ( 62 ) a zener diode ( 63 ) is connected in anti-parallel. LED luminaire with an LED lamp according to one of the preceding claims, and optionally one with the converter ( 6 ) in series choke ( 3 ) and / or a fuse replacing a starter ( 11 ). Method for detecting the aging of an LED lamp, in particular according to one of Claims 1 to 10, in which the voltage drop across the array of LEDs is measured, and the result of the measurement is used to conclude the aging condition of the LED lamp. The method of claim 12, wherein the measured voltage is compared with a reference value, and it is determined from the comparison result, whether the LED lamp has reached its end of life.

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